SSH-сервер Dropbear на Android: разрешение запрещено (publickey)

Question

Я скомпилировал и успешно установил на моем устройстве Android сервер dropbear через adb. При попытке установить соединение через ssh из моего Ubuntu 18.04 я получаю следующую ошибку: Permission denied (publickey).

Полный журнал отладки:

ssh root@192.168.1.4 -i id_rsa -vvv
OpenSSH_7.6p1 Ubuntu-4, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "192.168.1.4" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 192.168.1.4 [192.168.1.4] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4
debug1: Remote protocol version 2.0, remote software version dropbear_2015.67
debug1: no match: dropbear_2015.67
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 192.168.1.4:22 as 'root'
debug3: hostkeys_foreach: reading file "/home/gertec/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/gertec/.ssh/known_hosts:18
debug3: load_hostkeys: loaded 1 keys from 192.168.1.4
debug3: order_hostkeyalgs: prefer hostkeyalgs: [e-mail],[e-mail],[e-mail],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[e-mail],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [e-mail],[e-mail],[e-mail],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[e-mail],[e-mail],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail]
debug2: ciphers stoc: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail]
debug2: MACs ctos: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[e-mail],zlib
debug2: compression stoc: none,[e-mail],zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: [e-mail],ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,[e-mail]
debug2: host key algorithms: ecdsa-sha2-nistp521,ssh-rsa,ssh-dss
debug2: ciphers ctos: aes128-ctr,aes256-ctr,aes128-cbc,aes256-cbc,3des-ctr,3des-cbc
debug2: ciphers stoc: aes128-ctr,aes256-ctr,aes128-cbc,aes256-cbc,3des-ctr,3des-cbc
debug2: MACs ctos: hmac-sha2-256,hmac-sha2-512,hmac-sha1-96,hmac-sha1,hmac-md5
debug2: MACs stoc: hmac-sha2-256,hmac-sha2-512,hmac-sha1-96,hmac-sha1,hmac-md5
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: [e-mail]
debug1: kex: host key algorithm: ecdsa-sha2-nistp521
debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp521 SHA256:NxZ7Y8JckKit2IXIrPQPkgx2gOIyGikFwAvxBQNysNI
debug3: hostkeys_foreach: reading file "/home/gertec/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/gertec/.ssh/known_hosts:18
debug3: load_hostkeys: loaded 1 keys from 192.168.1.4
debug1: Host '192.168.1.4' is known and matches the ECDSA host key.
debug1: Found key in /home/gertec/.ssh/known_hosts:18
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 4294967296 blocks
debug2: key: id_rsa ((nil)), explicit
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: id_rsa
debug3: sign_and_send_pubkey: RSA SHA256:slWiOnisF6hwwk4E0+NSwUpEmn8TM8+zgXQp8FZAgl0
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
root@192.168.1.4: Permission denied (publickey).

Я уже пытался сгенерировать ключи со стороны андроида и со стороны линукса тоже. Не было успеха. Разрешения на стороне adnroid следующие:

drwx------ root     root              2018-10-02 02:48 .ssh
-rwxrwxrwx root     root       265500 2018-11-01 12:46 dropbear
-rw------- root     root          459 2018-10-02 02:54 dropbear_dss_host_key
-rw------- root     root          805 2018-10-02 02:53 dropbear_rsa_host_key
-rwxrwxrwx root     root       174344 2018-11-01 14:04 dropbearconvert
-rwxrwxrwx root     root       166140 2018-11-01 12:46 dropbearkey

OBS: Закрытый клиентский ключ находится в папке ~/.ssh с именем id_rsa, а открытый ключ - на Android в /data/dropbear/.ssh/authorized_keys.